It's getting serious! Simon Baker introduces 'mystery new girlfriend' to his kids as they spend Easter weekend frolicking at Byron Bay beach

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Things seem to be getting serious between Simon Baker and the mystery blonde woman believed to be his girlfriend. 

The Mentalist star, 53, was spotted introducing his sons Claude, 24, and Harry, 21, to the woman as they enjoyed a visit to the beach in Byron Bay on Monday. 

Simon, who shares three kids with ex-wife Rebecca Rigg, was spotted frolicking through the water with the blonde, before returning to the sand to catch up with his lookalike sons. 

Looking fit and fantastic, the actor went shirtless in a pair of black swim trunks. 

His glamorous companion meanwhile wore a white swimsuit that showcased her athletic physique and long legs. 

Simon Baker, 53, (left) hit the beach in Byron Bay with the mystery blonde believed to be his girlfriend (right) on Monday

Simon Baker, 53, (left) hit the beach in Byron Bay with the mystery blonde believed to be his girlfriend (right) on Monday 

Proving that things are getting serious, the Mentalist star was spotted introducing the unidentified woman to his sons Claude, 24, and Harry, 21. (All pictured)

Proving that things are getting serious, the Mentalist star was spotted introducing the unidentified woman to his sons Claude, 24, and Harry, 21. (All pictured) 

Looking fit and fantastic, the actor went shirtless in a pair of black swim trunks

Looking fit and fantastic, the actor went shirtless in a pair of black swim trunks 

She swept her hair up in a bun and completed her look with a collection of pendant necklaces and delicate bracelets.

The woman looked at ease chatting and joking with Simon's sons, suggesting it may not be their first meeting. 

The pair have been spotted by each other's side on several occasions over the past few months.  

In March, the woman was photographed picking him up from Sydney Airport.

His glamorous companion meanwhile wore a white swimsuit that showcased her athletic physique and long legs

His glamorous companion meanwhile wore a white swimsuit that showcased her athletic physique and long legs

She swept her hair up in a bun and completed her look with a collection of pendant necklaces and delicate bracelets

She swept her hair up in a bun and completed her look with a collection of pendant necklaces and delicate bracelets

The woman looked at ease chatting and joking with Simon's sons, suggesting it may not be their first meeting

The woman looked at ease chatting and joking with Simon's sons, suggesting it may not be their first meeting

Simon looked like he was racing the woman to the sand

 Simon looked like he was racing the woman to the sand 

Simon had flown in from Europe where he attended the Berlinale International Film Festival in Berlin for his film Limbo. 

In November, he was also spotted enjoying a dip in Bondi with a blonde beauty, believed to be the same woman.

Simon was previously linked to Byron Bay fashion designer Laura May Gibbs.

The pair have been spotted by each other's side on several occasions over the past few months

The pair have been spotted by each other's side on several occasions over the past few months

In March, the woman was photographed picking him up from Sydney Airport

In March, the woman was photographed picking him up from Sydney Airport

Simon had flown in from Europe where he attended the Berlinale International Film Festival in Berlin for his film Limbo

  Simon had flown in from Europe where he attended the Berlinale International Film Festival in Berlin for his film Limbo

In November, he was also spotted enjoying a dip in Bondi with a blonde beauty, believed to be the same woman

In November, he was also spotted enjoying a dip in Bondi with a blonde beauty, believed to be the same woman

Before that he was married to Australian actress Rebecca Rigg. 

The couple met in the early '90s and they married in 1998 after five years of living together.

They share three children, Stella, 29, Claude, and Harry.

Simon was previously linked to Byron Bay fashion designer Laura May Gibbs

  Simon was previously linked to Byron Bay fashion designer Laura May Gibbs

Before that he was married to Australian actress Rebecca Rigg. The couple met in the early '90s and they married in 1998 after five years of living together

  Before that he was married to Australian actress Rebecca Rigg. The couple met in the early '90s and they married in 1998 after five years of living together

They share three children, Stella, 29, Claude, and Harry

 They share three children, Stella, 29, Claude, and Harry